| Ct value range | Number of RT-qPCR positive samples | Number (%) of sequence confirmed samples a |
| 20-23 | 4 | 3 (75) |
| 24-27 | 3 | 3 (100) |
| 28-31 | 18 | 13 (72.2) |
| 32-36 | 41 | 9 (22.0) |
| 37-40 | 61 | 1 (1.6) |
| a) hemi nested PCR |
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